I took the index on the words, transformed the number to binary, added a few zeros, calculated the sha256 digest, took the very first Portion of the hexadecimal to convert it to binary, extra 3 zeros into the eight digits with the binary and bought 00000010011 which translates to 19 https://artybookmarks.com/story18726598/the-basic-principles-of-bip39-passphrase-generator